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E. GRAUERT.

- DYNAMO ELECTRIC MACHINE. No. 327,790. Patented Oct. 6, 1885,

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E. GRAUERT.

DYNAMO ELECTRIC MACHINE. No. 327.790. Patented Oct. 6, 1885.

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UNITED STATES PATENT OFFICEO EDGAR GRAUERT, OF NEW YORK, N. Y.

DYNAMO-ELECTRIC MACi-HNE.

SPECIFICATION forming part of Letters Patent No. 327,790, dated October6, 1885.

Serial No. 151,757. (No model.)

To aZZ whom it may concern.-

Be it known that I, EDGAR GRAUERT, of the city, county, and State of NewYork, have invented certain new and useful Improvements inDynamo-Electric Machines, of which the following is a specification.

This invention has reference to certain improvements in dynamo-electricmachines of that class in which an armature of the Paci notti type isused; and the invention consists in a dynamoelectric machine of animproved supportingframe for a sectional armature and an improvedconstruction of armature, as will more fully appear hereinafter, andfinally be pointed out in the claims.

Inlthe accompanying drawings, Figure 1 represents a. plan of my improveddynamoelectricmachine. Figs.2and3arerespectively aside and end elevationof the machine. Fig. 4 is avertical longitudinal section of the armatureon line :0 00, Fig. 5, drawn on a larger scale. Fig. 5 shows at one sideopposite end elevations of the armature-disks, while the other halfshows an end view of the coils of the armature and a vertical transversesection of the same; and Figs. 6 and 7 are details of the soft-iron coreof the coils of the armature.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the field-magnets; B, thearmature which rotates between the enlarged pole-pieces of the same; 0,the commutator, jand D the switch, by which the armature is thrown in orout of circuit. The field-magnets A A are supported on a base-plate, A,to one end of which is secured an upright standard, A that supportsinsuitable bearings one end of the armature-shaft 13, while the oppositeend of the same turns in bearings of abell-shaped support, A attached tothe ends of the enlarged pole-pieces of the field-magnets A, as shownclearly in Figs. 1 and 2. The armature B is formed of a series ofindependent inductioircoils F, the cores of which are recessed at thesides, so as to be engaged by longitudinal bars 6 c, of oblongcross-section, which are arranged intermediately between the coils E,and attached to the supporting end disks, B keyed to the armature-shaftB.

The ends of the longitudinal bars 6 e are passed through oblong openingsof the disks B insulated therefrom by means of thimbles c, and securedto one disk, B by enlarged heads 6 and to the other disk B by screw-nutse", as shown in Fig. 4. The induction-coils E E are supported rigidly inposition by the said disks B and bars 6 e, which latter interlock withthe recessed cores of the coils. The cores of the induction-coils areformed of a series of soft-iron plates, f, which are strung upon acentral brass rod, f, and separated by intermediate brass washers, f, asshown clearly in Figs. 6 and 7. The core plates f f form segments of acircle, are recessed at the sides for the bars 6 0, and have centralopenings for the connecting-rods f. The rods f are provided at the endswith screw-nuts f, so as to keep the core-plates firmly in position onthe center rods, f. The nuts f are covered by semicircular wooden endpieces, f (shown in Fig. 6.)

In making the coils E the wire is wound on a form of the required size,after which the core is inserted into the coil. The coils are nextsecured to the disks B by passing the longitudinal bars 0 0 through thedisks and side recesses of the cores and fastening the ends of the barsto the disks. The cores of the induetioircoils form thereby acylindrical body, which is rigidly held in position by the longitudinalbars 0 e. The induction-coils are held apart by short wooden blocks h h,and are finally bound together by exterior bands, ii, that extendtransversely around the coils and blocks.

The described construction andsupport of the induction-coils admit theremoving and replacing of any one coil, in case {the same should beinjured by use, without disturbing the remaining coils. For this purposeit is simply necessary to withdraw the two longi tudinal bars a c, thatsupport the core of the coil, remove the same and replace it by a newcoil that is secured in position by replacing the supporting-bars e c inposition on the disks B The ends of the induction-coils E E areconnected in the usual manner to the sections of the commutator O. Thecommutator O is composed ofa number of parallel metal strips,

i, which are recessed at one end and attached to the cylindrical hub Bof one of the disks B of the armature, as shown in Fig. 4:. The strips 2are insulated from the hub B and are made by sawing a metallic cylinderof the proper shape into the required number e'f strips i. The outerends of the sections 2' of the commutator are not separated byinsulating material, but simply by air-spaces. In this manner a verycheap and simple form of commutator is obtained, in which any sectionthat may be oxidized or worn out by use can be quickly exchanged. Thecom mutator-brush es 0 are made of any suitable construction and held incontact with the sections of the commutator 0. They are supported onradial arms 0, which are attached to a ring, C, that is axiallyadjustable on an extension hub of the standard Aflso as to set thebrushes into proper relative position to the commutator-sections bymeans ofaworm-gear, G, that may be operated by hand or by a suitableautomatic regulating mchanism, as preferred.

The advantages of my improved dynamoelectric machine are, first,simplicity of construction, as all the induction-coils can be wound upindependenly of each other and finally united into a cylindrical bodyaround the armature-shaft; second, the armature is kept cool, as theinduction-coils are open at both sides so that the air can freelycirculate through the cores of the same and prevent undue heating ol thecoils, third, the commuator is made of very simple construction and canbe readily repaired.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. A supporting-frame for a sectional armature,consisting of supporting disks or heads, longitudinal connecting-bars,and a series of recessed and separated core-plates fitted to said bars,substantially as set forth.

2. In a dynamo-electric machine, an arinature composed ofsupporting-disks, inductioncoils open at the sides and provided withcores formed of a series of recessed and separated core-plates, andlongitudinal supporting-bars that engage the recesses of thecore-plates, and are attached to the end disks of the armature,substantially as set forth.

In dynamoeleetric machines, an arma ture composed of a series ofinduction-coils open at the sides and provided with cores which areformed of a series of core-plates, intermediate washers, and centralconnecting screw-rods, substantially as set forth.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

EDGAR GRAIUERT.

IVitnesses:

PAUL GOEPEL, CARL KARI.

